/*------------------------------------------
  Responsive Grid Media Queries - 1280, 1024, 768, 480
   1280-1024   - desktop (default grid)
   1024-768    - tablet landscape
   768-480     - tablet
   480-less    - phone landscape & smaller
--------------------------------------------*/

@media all and (min-width: 768px) {
  #app {
    box-sizing: border-box;
    max-height: 667px;
    max-width: 375px;
  }

  #iphone-wrapper {
    display: block;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -49.5%);
  }
}

@media all and (min-width: 1280px) { }

@media all and (min-width: 1024px) and (max-width: 1280px) { }

@media all and (min-width: 768px) and (max-width: 1024px) { }

@media all and (min-width: 480px) and (max-width: 768px) { }

@media all and (max-width: 480px) { }


/* Portrait */
@media screen and (orientation:portrait) { /* Portrait styles here */ }
/* Landscape */
@media screen and (orientation:landscape) { /* Landscape styles here */ }


/* CSS for iPhone, iPad, and Retina Displays */

/* Non-Retina */
@media screen and (-webkit-max-device-pixel-ratio: 1) {
}

/* Retina */
@media only screen and (-webkit-min-device-pixel-ratio: 1.5),
only screen and (-o-min-device-pixel-ratio: 3/2),
only screen and (min--moz-device-pixel-ratio: 1.5),
only screen and (min-device-pixel-ratio: 1.5) {
}

/* iPhone Portrait */
@media screen and (max-device-width: 480px) and (orientation:portrait) {
}

/* iPhone Landscape */
@media screen and (max-device-width: 480px) and (orientation:landscape) {
}

/* iPad Portrait */
@media screen and (min-device-width: 481px) and (orientation:portrait) {
}

/* iPad Landscape */
@media screen and (min-device-width: 481px) and (orientation:landscape) {
}

<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />